Glock 17/17L/19X/34/45 Magazine Extension – +5 Round – G17 17-Round Base Pad
PLEASE DOUBLE CHECK DETAILS AND FITMENT BEFORE PURCHASE.
The Agency Arms G17-compatible magazine extension is an aluminum base pad built for Glock 17-pattern 17-round magazines. It adds usable capacity, includes a chrome silicon alloy spring, and gives the magazine an extended ledge that can help with one-handed manipulations when the setup is installed correctly.
Available options are organized below under Variants. This parent card covers the Black, Ronin Red, and Sage OD Green versions. Same core job, different finish and engraving flavor — because sometimes your mag extension needs to do work and still look like it has a gym membership.
Fitment
- Designed for Glock 17-pattern 17-round magazines.
- Agency Arms lists the Black version as compatible with all-generation Glock 17, Glock 17L, Glock 34, Glock 45, and Glock 19X magazines when the Glock 19X does not have the lanyard loop grip plug installed.
- Ronin Tactics and Sage Dynamics versions are listed by Agency Arms as G17 9mm +5 base pads for 17-round magazines, all generations.
- Retailer/distributor listings also reference Glock 17/22 compatibility for the Ronin and Sage versions; for safest customer guidance, treat this as a Glock 17-pattern full-size magazine extension and verify the exact magazine body before purchase.
- Adds +5 rounds for 9mm applications when used on the correct 17-round magazine body.
- Agency Arms lists +4 rounds for .40 S&W and .357 applications where compatible.
Does NOT fit
- Does not fit 10-round magazines.
- Does not fit reduced-capacity magazines.
- Does not fit Glock 19 compact magazines, Glock 26 subcompact magazines, or slimline Glock magazines.
- Does not fit Glock 19X setups with the lanyard loop grip plug still installed.
What it does
This extension replaces the factory magazine floor plate and increases capacity on compatible Glock 17-pattern magazines. The included stronger spring helps support reliable feeding with the added magazine length and capacity.
Why it’s worth it
This is the kind of upgrade that makes sense for range setups, competition-style magazine builds, PCC setups that run Glock-pattern magazines, and customers who want more rounds in the mag without buying mystery-brand junk. It is machined aluminum, hard anodized, and built by a known shop — not gas-station tactical gear with an Allen screw and a prayer.
Specs
- Brand: Agency Arms
- Product type: Magazine extension / base pad
- Platform: Glock 17-pattern full-size magazines
- Capacity increase: +5 rounds for 9mm
- Capacity increase: +4 rounds for .40 S&W / .357 where compatible
- Material: 6061 aluminum
- Finish: Hard anodized
- Spring: Chrome silicon alloy spring
- Marking panel: Dot matrix panel for magazine marking
- Manipulation feature: Extended ledge for one-handed manipulations
- Available variants: Black, Ronin Red with Ronin Tactics Cherry Blossom logo, Sage OD Green with Sage Dynamics engraving
- Made in USA
What’s included
- Agency Arms magazine extension/base pad
- Chrome silicon alloy magazine spring
Tools needed
Basic magazine disassembly tools may be needed. A small punch or Glock magazine tool can help remove the factory floor plate without turning the job into a countertop wrestling match.
Install notes
Unload the magazine completely before installation. After installation, hand-cycle and live-fire test the magazine with your intended ammo before trusting it for serious use. Magazine extensions are simple parts, but simple does not mean “skip testing like a clown with a credit card.”
Verify before you buy
Verify that your magazine is a compatible Glock 17-pattern 17-round magazine. Do not buy this for 10-round, reduced-capacity, compact, subcompact, or slimline Glock magazines. If you are using a Glock 19X, confirm the lanyard loop grip plug is not installed.
Helpful Buying Paths
Browse Glock parts, compare Base Pads & Extensions, check related Magazines & Extensions, or shop related springs for compatible parts and accessories.
Disclaimers
⚠ Glock Disclaimer
IronKells Armory LLC is not affiliated with, endorsed by, or sponsored by Glock, Inc. or Glock Ges.m.b.H.
All references to GLOCK® are used solely to identify firearm models, parts compatibility, and fitment information for customers. Glock is a federally registered trademark of Glock, Inc. and Glock Ges.m.b.H.
Any product sold on this site referencing Glock is aftermarket, not OEM, and is not manufactured by Glock. Glock does not warranty, authorize, or guarantee the performance, safety, or reliability of any third-party components or modifications.
Firearm parts should be installed by a qualified armorer or gunsmith. Improper installation, modification, or use of aftermarket components may affect firearm safety, reliability, and void manufacturer warranties. By purchasing and installing third-party parts, the buyer assumes all responsibility for safe handling, installation, function testing, and use of their firearm and accessories.
⚠ Install & Compatibility Disclaimer
Installation should be performed by a qualified armorer or gunsmith. Improper installation, modification, or use may affect firearm safety and reliability. Buyer is responsible for verifying compatibility, performing proper function testing, and ensuring safe operation.
Buyer is responsible for compliance with all local/state laws regarding magazine capacity.
⚠️ LEGAL DISCLAIMER
Don’t be that guy ordering 30-round mags in ban states. We don’t ship to restricted zones unless you’ve got the paperwork and Odin’s blessing. You’ve been warned.
Note on Shipping
⚠️ High-capacity magazine laws suck, and unfortunately this item cannot ship to CA, CO, CT, DC, HI, IL, MA, MD, NJ, NY, RI, WA, VT, or other restricted states. Adult signature required where applicable.
